Another Betta fish question

It's a misconception that Betta fish have to be kept alone they don't, although what they are kept with is of prime importance.
You must not keep two male siamese fighters together as they will fight to the death. They will live quite happily in a tank with mixed small tetras and various corydoras cats. A few females can be kept with them and if the conditions are right they will start to build bubblenests.
It's not a good idea to try to keep them with members of the barb or large danio species who will enjoy nipping their flowing tails until they are shredded.